The OpenBTS project The OpenBTS (Base Transceiver Station) project is an effort to construct an open-source Unix application that uses the Universal Software Radio Peripheral (USRP) to present a GSM air interface ("Um") to standard GSM handsets and uses the Asterisk software PBX to connect calls. The OpenBTS uses the USRP hardware to receive and transmit the GSM signaling. This is done by using the GNU Radio framework. The Asterisk is used to interface the GSM calls between the cellular phones under the OpenBTS network. Any other device that can be connected to the Asterisk can be also used

The OpenBTS uses the USRP hardware to receive and transmit the GSM signaling. This is done

by using the GNU Radio framework. The Asterisk is used to interface the GSM calls between

the cellular phones under the OpenBTS network. Any other device that can be connected to

the Asterisk can be also used The OpenBTS uses the USRP hardware to receive and transmit the GSM signaling. This is done

by using the GNU Radio framework. The Asterisk is used to interface the GSM calls between

the cellular phones under the OpenBTS

The OpenBTS project

The OpenBTS (Base Transceiver Station) project is an effort to construct an open-source Unix

application that uses the Universal Software Radio Peripheral (USRP) to present a GSM air

interface ("Um") to standard GSM handsets and uses the Asterisk software PBX to connect

calls.

The OpenBTS uses the USRP hardware to receive and transmit the GSM signaling. This is done

by using the GNU Radio framework. The Asterisk is used to interface the GSM calls between

the cellular phones under the OpenBTS network. Any other device that can be connected to

the Asterisk can be also used

Hardware: 01 - Computer (Core 2 Duo 2.0 GHz, 2GB RAM, USB port);

01 - USRP-PKG (USRP Package, includes Motherboard, Enclosure, 2 RF Cables, USB Cable, Power Supply, and Hardware Package – USD 700);

02 - RFX900 for GSM 850/900 (800-1000MHz Transceiver, 200 mW output – USD 275 each);

02 - RFX1800 for GSM 1800/1900 (1.5-2.1 GHz Transceiver, 100 mW output – USD 275 each);

02 - VERT900 (824-960 MHz, 1710-1990 MHz Quad-band Cellular/PCS and ISM Band Vertical Antenna, 3dBi Gain, 9 Inches, Ideal for RFX900 and RFX1800).

01 - Unlocked cellular phone;

01 - SIM Card (preferred for those with possibility to edit network list).

All hardware items except the computer, cell phone and SIM Card can be found directly from

OpenBTS Installation and Configuration Guide v0.1 2009 Page | 16 Use of this software may be subject to other legal restrictions, including patent licsensing and radio spectrum licensing. All users of this software are expected to comply with applicable regulations. 1242936099.801724 3082733248: Starting the system... 1242936100.8228 WARNING 3082733248 TRXManager.cpp:269: retrying transceiver command after response timeout 1242936101.0380 INFO 3052067728 RadioResource.cpp:366: Pager::pageAll paging 0 mobile(s) 1242936101.0382 INFO 3082733248 OpenBTS.cpp:199: system ready 1242936101.038262 3082733248: Welcome to OpenBTS. Type "help" to see available commands.